Rear Suspension Squeak

[Alluminio]

In addition to my alarm horn issue - hopefully now sorted - the rear suspension squeaks are next on my 'must-do' list.

The squeaks are the same from either side and can be heard by gently depressing the rear of suspension when the car is stationary. A friend and I have doused the rear joints and springs with silicon lubricant and it still persists.

The squeak is heard mainly when travelling slowly.

My suspicion is the springs, specifically where they sit upon the mounts, but having given these a thorough spray with the lubricant the annoying squeaks remain.

Any ideas?!